Magnetically encodable card having magnetic pigment uniformly dispersed in plastic

• US 5,698,839 A
• Filed: 04/07/1995
• Issued: 12/16/1997
• Est. Priority Date: 04/07/1995
• Status: Expired due to Term

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: James, Robert Owen, Jeffers, Frederick John, Jagielinski, Tomasz Mark
• Primary Examiner(s): Hajes, Donald T.
• Assistant Examiner(s): FRECH, KARL D
• Application Number:
  US08/418,336
• Time in Patent Office: 984 Days
• Field of Search: 235/493, 235/449, 235/492, 428/692, 428/693, 428/694
• US Class Current: 235/493
• CPC Class Codes: G06K 19/06196 Constructional details

Abstract

A magnetically encodable card made of a solid plastic material having uniformly dispersed magnetic particles throughout the plastic material. The card is preferably formed of two major faces with connecting edges. Data can be recorded on one or both of the major faces, and can also be recorded on one or more of the card edges.

Claims

1. A magnetically encodable card comprising a body having upper and lower surfaces and first, second, third, and fourth edges, said body being formed of a plastic material having magnetic particles non-randomly, uniformly dispersed throughout the plastic material and capable of magnetically recording data.

2. The magnetically encodable card of claim 1, wherein the volume of said magnetic particles in said plastic material is in a range from substantially 0.001 percent to substantially 0.10 percent by volume of said plastic material, not affecting the plastic transparency or color of the plastic material.

3. The magnetically encodable card of claim 1, wherein said volume of magnetic particle in said plastic material is in a range from substantially 0.01 percent to substantially 0.03 percent by volume of said plastic material.

4. The magnetically encodable card of claim 1, wherein said magnetic particles are of high coercivity material having a coercivity greater than 3000 Oersted.

5. The magnetically encodable card of claim 1, wherein said magnetic particles have a coercivity of less than 3000 Oersted.

6. The magnetically encodable card of claim 1, wherein said magnetic particles have very low coercivity of less than 1 Oersted.

7. The magnetically encodable card of claim 1, wherein said data is magnetically recorded on one or more of said surfaces of said card.

8. The magnetically encodable card of claim 1, wherein data is magnetically recorded on at least one of said edges of said card.

9. The magnetically encodable card of claim 1, wherein said magnetic particles are of barium or strontium ferrite material or mixtures thereof.

10. The magnetically encodable card of claim 1 wherein said card includes a magnetic stripe.

11. The magnetically encodable card of claim 1 wherein said card includes a memory chip.

12. The magnetically encodable card of claim 1 wherein said card includes a magnetic strip and a memory chip.